Update 4th March 2016 - Shapeways now offers all the plunger plates coated and sealed so no need to clear it yourself, simply apply some double sided tape and press into place.
This would be a great mod for AC/DC, Metallica, Kiss, Aerosmith and maybe even Elvis. There is a recess in the back to suit older Bally / WMS plunger housings as well.
There is a volume control plunger knob as well to really finish off the look. Have fun and crank the volume with this Quad Speaker / Amp mod. To find the other related parts for the full kit / mod setup lookup - "swinksvolume" or "swinksshooter"
The photos show a Marshall Volume Plunger Knob which is also available from Shapeways as well.
Note: Marshall has given permission to use the logo their logo - therefore a percentage of the earnings will be donated to organisation that helps kids from Swinks & Marshall.
There are a few Pinball Plunger Plates available - search swinksshooter